Dr E. Buxbaum EB15 at
Mon May 12 07:48:01 EST 1997

a8803349 at (Martin Offterdinger) wrote:

>I learned that many people use fluorescein, but this fluorochrome
>seems to be very sensitive to bleaching-so why is it still the most
>commonly used?

Because the amount of emitted light for a given amount of absorbed light, 
the fluorescent yield, is very high in fluorescein. Additionally, the 
wavelength of the yellow-green fluorescence of fluorescein is close to 
the peek sensitivity of the human eye. Both factors result in brighter 
pictures. Fluorescein is also relatively cheap.
The problem of bleaching can be controlled to some extend by the use of 
anti-fade mouning media.

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